Repost your question. Unclear as typed.
<span>6(-3r)=-39+3r
-18r = -39+3r
39 = 18r + 3r
39 = 21r
39/21 = r
13/7 = r
r = 13/7</span>
Answer:
$350
Step-by-step explanation:
3 lawns --------------> $105
find unit rate:
1 lawn -------------> $105 ÷ 3 = $35 per lawn
10 lawns --------> $35 per lawn x 10 lawns = $350
Given:

Prove:

Solution:

Putting the value of equation (ii) into the equation (i):

putting the value x into the equation (i):

Therefore, the value of x= 4
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brainly.com/question/6219408