12. When Raphael solved the system below by using the method of elimination, he changed the second equation to -8x – 2y=-2. What property justifies this manipulation?
8x + 3y = 7
4x + y = 1

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°

Iwill arward ! , i if bt ≅ eu , bu ≅ et , prove: ∠b ≅ ∠e. fill in the blanks: draw segment ut ≅ bt≅ bu ≅ △ubt ≅ △