Berta worked to solve a system of equations.4x + y = –5x – y = –5step 1: 2: x = –2step 3: 4(–2) + y = –5step 4: –8 + y = –5step 5: y = 3berta determined that the solution is (–2, 3).which could have been the equation berta found in step 1? 4x = 05x = 105x = –105x = –25

We have that
4x + y = –5> equation 1
 x – y = –5 > equation 2

step 1
Adds equation 1 and equation 2
4x + y = –5
 x – y = –5

(4x+x)=-5-5
5x=-10> equation in Step 1

step 2
find the value of x
x=-10/5
x=-2

step 3
substitute the value of x in the equation 1
4x + y = –5> 4*(-2)+y=-5

step 4
-8+y=-5

step 5
y=-5+8
y=3

the solution is (–2, 3)

therefore

the answer is
The equation in Step 1 is
5x=-10

One shot. if 60% of 10 is 6, then what is 70%? we know it would be seven (since 60% is mathematically 60/100, or 6/10, then 70% is 70/100, or 7/10) but we can check anyway using ratios: 6 : 60% = x : 70%*inverse multiplicationx * 60% = 6 * 70%*divide both sides by 60%x = (6 * 70%) / 60%x = 7and since he has made 6 shots already, he would need just one more to get 7 shots or 70%. if the explanation is too confusing, comment and i will try to