How do u solve these two equations ??

a + 2b = 4
3a + b = 7

Step-by-step explanation:

a + 2b = 4

3a + 6b = 12

3a + b = 7

5b = 5

b = 1

a = 2 because

2(1) + a = 4

Step-by-step explanation:

We know that:

Work:

        3a + b = 7

        3a + b = 7

Now, let's substitute the value of b into the first equation.

Hence, the missing values are:

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)

need more info

step-by-step explanation: