1 If 3n + 7 = 25, then find the value of the expression 8n - 3 2 In ∆ DEF and ∆ XYZ, DE = XY, angle E = angle Y and EF = YZ. Name the
test of congruency by which both the triangles are congruent.
3 The equation for the statement ‘The sum of seven times m and
fourteen gives 77’ is _.
4 The base of a triangle is 18 cm and its area is 36 sq. cm. The height of
the triangle is _ cm.
5 If two triangles are congruent under the correspondence P ↔ Y , Q ↔
Z , R ↔ X , then it can be said that ∆ PQR ≅ _

Arrange the steps to solve this system of linear equations in the correct sequence. x + y = -2 2x – 3y = -9 tiles subtract 3x + 3y = -6 (obtained in step 1) from 2x – 3y = -9 (given) to solve for x. substitute the value of x in the first equation (x + y = -2) to get y = 1. the solution for the system of equations is (-3, 1). x = -15 the solution for the system of equations is (-15, 13). add 3x + 3y = -6 (obtained in step 1) to 2x – 3y = -9 (given), and solve for x. x = -3 substitute the value of x in the first equation (x + y = -2) to get y = 13. multiply the first equation by 3: 3(x + y) = 3(-2) 3x + 3y = -6.